You can.. sort of .. do this. vBulletin lets you promote users after paying a fee, it's called "subscriptions", this means that after the user pays a certain amount (via paypal), it get promoted to a new usergroup. That new usergroup has access to the new forum.

This way, you can have basic forums for everyone to see, and premium forums that can only be seen by certain members. You can then next month setup a new subscription and create the new forum that will be created for the premium members of that month, or any setup that you want.

It is certainly possible to tweak the functionality and come very close to what you can.

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